Assume you have a convex lens with f = 9 cm. If the object is placed 18 cm from

Question

Assume you have a convex lens with f = 9 cm. If the object is placed 18 cm from the lens, how far is the image from the lens? What is the lateral magnification? Is the image upright or inverted?   Is the image real or imaginary?

__________ cm

__________ times

A. Upright
B. Inverted A. Real
B. Imaginary


Assume you have a convex lens with f = 9 cm. If the object is placed 18 cm from the lens, how far is the image from the lens? What is the lateral magnification? Is the image upright or inverted?   Is the image real or imaginary?

__________ cm

__________ times

A. Upright
B. Inverted A. Real
B. Imaginary

Explanation / Answer

The focal length f = 9cm the distance of the object do = 18cm the from lens formula 1/f = 1/do + 1/di therefore the image distance di = fdo / do - f = (9)(18) / 18-9 = 18cm Now the lateral magnification m = -di/do = - 18cm /18cm = -1 therefore the final image is inverted real image.

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